[PATCH] ppc64: Clean up prom functions in prom.c

From: Rusty Russell <rusty@rustcorp.com.au>

1) Define PROM_ERROR: checks for call_prom() < 0 are bogus (returns ulong)
2) All OF access functions should be marked __init.
3) prom_strtoul isn't used at all.

include/asm-ppc64/prom.h

@@ -260,7 +260,6 @@ extern int of_remove_node(struct device_node *np);
 /* Other Prototypes */
 extern unsigned long prom_init(unsigned long, unsigned long, unsigned long,
 	unsigned long, unsigned long);
-extern void prom_print(const char *msg);
 extern void relocate_nodes(void);
 extern void finish_device_tree(void);
 extern int device_is_compatible(struct device_node *device, const char *);